Re: How to change to Linux from windows when the db has a big size

Indeed - Slony-I will be your best bet if you wish to avoid extended
downtime. However, Slony-I is not the simplest thing to set up and use. You
will need to spend time reading the manual. You will also need to test it
first. Do not just attempt it on your live database and hope it will work.

A possibly simpler alternative may be Londiste. Unlike Slony it cannot
replicate DDL, but if you do a pg_dump --schema-only and restore that to
the new server you can then set up Londiste to replicate the data. I've
worked with 100GB+ databases with Londiste, but not 1TB, and I don't know
your schema so I can't promise it'll work. It's not very intrusive though,
so if you have problems it's easy to remove.

By the way, the BDR project has a component that's designed to help with
this (currently called "UDR") but it only works on PostgreSQL 9.4, and not
yet on Windows. It's simpler than Slony-I, but both get the same job done.

In any case: if you need low-downtime, use Slony. If you want it to be done
faster and simpler, but with downtime, use pg_dump and pg_restore in
parallel mode.

You cannot simply copy the data directory. There is no way to in-place
convert a Windows PostgreSQL data directory for Linux use or vice versa.

On 13 January 2015 at 12:58, Shreeyansh dba <shreeyansh2014(at)gmail(dot)com>
wrote:

>
>
> On Tue, Jan 13, 2015 at 7:31 AM, 张得群 <184062459(at)qq(dot)com> wrote:
>
>> Hello,I have a database on Windows 7 ,Postgresql 9.3,its size is about
>> more than 1T,now I want to transfer the platform to Linux ,are there any
>> good ways to do it? The pg_dump command is too slow ,what I want is that
>> can I just connect my hd to linux and set some configures about
>> postgresql?Thank you !
>>
>
>
> Hi,
>
> Though pg_dump is a better option, but as your database size very large it
> requires more downtime which results performance of pg_dump slow. Slony
> replication is the best option for performing large database upgrades which
> results in less downtime as you are moving out of Windows to Linux.
>
>
> Hope this will solve your issue.
>
>
>
>
>
>
>
>
> --
> Thanks & Regards
> *Venkataramana Aitla*
> *Database Administrator*
> www.shreeyansh.com
>

--
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PostgreSQL Development, 24x7 Support, Training & Services